My digital thermomter is reading 209* sitting in boiling water. I'm in the midwest, so it's not an issue of sealevel. I need to calibrate this thing, but to do it I need to make sure the ice water solution is 32*. I have been trying to get my glass lab thermometer to read 32* in the ice water but closest I can get is about 33, almost 34*. I'm guessing that is what throws my digital thermometer off. I have the lab thermomter sitting in a glass of crush ice in the fridge, as it sits for several hours and melts and gets cold enough to read 32* that is when I am going to try calibrating my digital thermomter to that. I guess we will see how that goes.